IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0562199
(2006-11-21)
|
등록번호 |
US-8256990
(2012-09-04)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
5 인용 특허 :
15 |
초록
Drainage units comprise lightweight aggregate held within a perforated sleeve having an exterior surface, where at least a portion of the exterior surface comprises a barrier material which is substantially impervious to solids.
대표청구항
▼
1. A pre-assembled drainage unit having a generally cylindrical shape, an exterior surface, a circumference, and a length, for burial in soil which is in contact with the exterior surface of the drainage unit, comprising: a sleeve longitudinally extending along a portion of the length of the exterio
1. A pre-assembled drainage unit having a generally cylindrical shape, an exterior surface, a circumference, and a length, for burial in soil which is in contact with the exterior surface of the drainage unit, comprising: a sleeve longitudinally extending along a portion of the length of the exterior surface of said cylindrical drainage unit, the sleeve comprised of a combination of netting and a first portion of barrier sheet;wherein, the barrier sheet is made of water permeable material resistant to passage of fine solids and has (a) said first portion extending lengthwise and circumferentially, thereby forming a portion of the exterior surface of the drainage unit; and(b) two movable second portions, each second portion running along an opposing lengthwise side of the first portion as a flap which is foldable laterally with respect to the lengthwise direction of the drainage unit; and,lightweight aggregate contained within the sleeve. 2. The drainage unit of claim 1 wherein said netting underlies the barrier and wholly contains the aggregate; and, wherein the first barrier sheet portion is attached to the exterior of the netting. 3. The drainage unit of claim 2, wherein the barrier is attached to the sleeve by means selected from the group consisting of physical attachment, adhesive means, thermal treatment, chemical treatment, and combinations thereof. 4. The drainage unit of claim 2 wherein the barrier sheet first portion extends between 60 and 180 degrees circumferentially around the exterior of the drainage unit. 5. The drainage unit of claim 2 wherein the barrier sheet first portion extends at least 180 degrees around the generally cylindrical exterior surface. 6. The drainage unit of claim 1 wherein said netting forms a first circumferential part of the exterior of the drainage unit; wherein said barrier sheet first portion forms a second circumferential part of the exterior of the drainage unit; and, wherein the netting and barrier sheet first portion are integrated to each other, to contain said aggregate. 7. The drainage unit of claim 6 wherein the first portion of the barrier sheet extends between 60 and 180 degrees circumferentially around the exterior of the drainage unit. 8. The drainage unit of claim 6 wherein the barrier sheet first portion extends at least 180 degrees around the generally cylindrical exterior surface. 9. The drainage unit of claim 1 wherein said barrier sheet first portion and netting are integrated into each other at two lengthwise extending areas. 10. The drainage unit of claim 1 further comprising: a perforated pipe running lengthwise within the aggregate. 11. A drainage system comprising one or more drainage unit assemblies of claim 1. 12. A drainage unit having a generally cylindrical shape, an exterior surface, a circumference, and a length, for burial in soil which is in contact with the exterior surface of the drainage unit, comprising: netting longitudinally extending along a portion of the length of the exterior surface of said generally cylindrical shape drainage unit, the netting forming a first circumferentially extending part of the exterior surface of the drainage unit;water permeable barrier sheet longitudinally extending along a portion of the length of the generally cylindrical exterior surface, said barrier sheet attached to the netting, for resisting passage of fine solids from the exterior of the drainage unit;the barrier sheet having a first portion which alone forms a second circumferentially extending part of the exterior surface of the drainage unit;wherein, said first circumferential netting part and said second circumferential barrier sheet part additively form the total circumferential surface of the unit;wherein said barrier sheet first portion has opposing lengthwise running sides and opposing ends running transverse to the length of the drainage unit;wherein, the netting and the barrier sheet first portion are integrated with each other to form a circumferential structure for circumferentially containing aggregate; and,lightweight aggregate contained within the circumferential structure comprised of said integrated sleeve and barrier sheet;wherein, said barrier sheet further comprises two moveable flap portions, each flap portion running lengthwise along an opposing side of said barrier sheet first portion and having a free end which is foldable laterally with respect to the length of said exterior surface of the drainage unit. 13. The drainage unit of claim 12 further comprising: a perforated pipe running lengthwise within the aggregate. 14. A drainage system comprising one or more drainage units of claim 12. 15. A drainage unit assembly comprised of a set of three horizontally adjacent and parallel generally cylindrical drainage units positioned lengthwise within a trench in soil, each drainage unit having an upward facing surface; wherein one unit of said set of three units is the center drainage unit, said center drainage unit lying between the other two of the three units of the set; each drainage unit of said set of three units comprising aggregate contained within netting; wherein, said center drainage unit is a drainage unit of claim 1, said center drainage unit comprising a barrier sheet having two movable second sheet portions. 16. The drainage assembly of claim 15, wherein each of said second movable sheet portions of the center drainage unit extends laterally from and lies on an upward facing surface of one of said adjacent drainage units. 17. The drainage assembly of claim 15 further comprising: a perforated pipe running lengthwise within the aggregate of at least said center drainage unit. 18. The drainage assembly of claim 15 wherein each of said sheet movable portions of the center drainage unit is sufficient in size to extend laterally from the center drainage unit to at least the highest elevation part of the upward facing surface of at least one of the other two drainage units of said set which is horizontally adjacent to said center drainage unit. 19. The drainage assembly of claim 15 wherein all three drainage units have the same construction as said center drainage unit. 20. A drainage system comprising one or more drainage units of claim 15. 21. A method of treating effluent from a septic tank within soil which comprises (a) providing a generally cylindrical first drainage unit having an exterior surface, an interior, and a length, the drainage unit comprised of (i) a longitudinally extending sleeve of netting having a length lying along the length of the first drainage unit;(ii) plastic aggregate contained within the sleeve; and,(iii) a barrier sheet havinga first fixed portion attached to or integral with the sleeve of netting in the circumferential and lengthwise directions, to thereby form a portion of the exterior surface of the first drainage unit, for resisting the passage of any fine solids within the soil from the exterior of the first drainage unit into the aggregate contained within the sleeve, andtwo movable barrier sheet second portions, each running along an opposing lengthwise side of said first fixed portion;wherein said opposing side second portions of said barrier sheet have free ends which are unattached to the first drainage unit and which are foldable with respect to the length of the first drainage unit;(b) placing the first drainage unit within a trench so it lies between and parallel to second and third drainage units and so the fixed portion of the barrier sheet of the first drainage unit is facing upwardly as the drainage unit lies in the trench; and(c) folding each of said opposing side movable barrier sheet second portions so the free end of each extends outwardly from the first drainage unit and rests on one of said second or third drainage units. 22. The method of claim 21 wherein said first drainage unit comprises a perforated pipe running lengthwise within said aggregate. 23. The method of claim 21 wherein the first drainage unit further comprises a length of perforated conduit, positioned within the interior of the first drainage unit, the conduit having a length which is greater than the length of the sleeve. 24. The method of claim 21 wherein step (b) comprises providing and placing second and third drainage units which are free of barrier sheets.
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